package com.mmal.commonUnsafe;

import com.mmal.annotation.NotThreadSafe;
import lombok.extern.slf4j.Slf4j;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;

/**
 * Created by sigurHe
 * Dte:2019/10/6.
 * Time:22:49.
 */
@Slf4j
@NotThreadSafe
public class StringExample1 {
    // 请求总数
    public static int clientTotal=5000;
    // 同时并发执行线程数
    public static int threadTotal=200;
    // 计数
    public static StringBuilder sb= new StringBuilder();

    public static void main(String[] args) throws InterruptedException {
        // 定义一个线程池
        ExecutorService executorService = Executors.newCachedThreadPool();
        // 信号量
        final Semaphore semaphore = new Semaphore(threadTotal);
        CountDownLatch countDownLatch = new CountDownLatch(clientTotal);
        for (int i = 0; i < clientTotal; i++) {
            executorService.execute(()->{
                try {
                    semaphore.acquire();
                    update();
                    semaphore.release();
                } catch (Exception e) {
                    log.error(e.getMessage(), e);
                }
                countDownLatch.countDown();
            });
        }
        countDownLatch.await();
        executorService.shutdown();
        log.info("size:{}", sb.length());

    }

    private static void update() {
        sb.append("1");

    }

}
